Hi Ko Ko- Yes, the book you cite, Pro EJB 3: Java Persistence API, covers the entire JPA, in depth. Our book, Beginning EJB 3 Application Development: From Novice to Professional, covers all of EJB 3, including the JPA, but does not go into as much detail. We have two chapters specifically on JPA.

From the How This Book Is Organized section in Chapter 1, here are summaries of these chapters:

Chapter 3: Entities and the Java Persistence API

The new Java Persistence API (JPA) is introduced, along with the various persistence services that are available to support entities both within a Java EE container and outside of one. This chapter covers basic O/R mappings and introduces the Java Persistence Query Language, or JPQL.

Chapter 4: Advanced Persistence Features

Delving into more advanced persistence concepts, this chapter describes the new support offered in the JPA for mapping entity inheritance hierarchies. Examples of the three supported inheritance mapping strategies identify the strengths and weaknesses of each approach, to help you decide which one best suits the particular needs of your application. This chapter also covers the ID (primary key) generators introduced in the JPA, for autopopulating ID values using a database sequence or table.

In addition, chapters on deployment, migration, and performance cover issues relating to the JPA. We also define an end-to-end application that demonstrats the use of JPA entities in the context of a complete Java EE 5 application.

Also, from the Table of Contents, here are the (condensed) outlines of Chapters 3 and 4:

It seems like your book covers many necessary topics about JPA in a shallow manner. I can see that the topics are to help the readers build a strong foundation in JPA.

By looking at the expanded TOC, I found out that EJB QL topic is not listed, but JPQL. Is "JPQL" in EJB 3.0 a new generation of EJB QL in EJB 2.0? According to the "EJB 3:JPA" book home page, it does cover the new features of EJB QL.